2. speakers
  3. 134917-76759

Jl audio fathom f212v2 noise and hum

Just picked up a pair of these to replace the svs pb1000 i had prior. However after plugging these in to the same outlet (its a panamaz suge protected outlet) i’m experiencing two things i did not experience with the svs pair.  1) there is constant low level noise, like a very low white noise that is present when on, even if not connected to anything else. 2) a cyclical hum that seems to come on when my panasoni vt60 plasma is on. I beleive these are likey using the same circuit/ are wired though on different outlets.

Ive tried rca and balanced cables. No discernable difference there.  The subs are massive to move but next step is im goint to try them on dedicated circuits in a different room to see if that does anything.  Open to ideas here and hoping there is a solution. Thanks! 
esthlos13
gakman
52 posts
 
Hi esthios13,

A couple years back I bought a Classe CT-2300 power amplifier and found the amp made a rhythmic hum sound. The sound came from the amp not through the speakers, turned out that my 60" Panasonic Plasma television was introducing DC voltage into the AC main circuit, and the amp (on the same circuit) didn't like that.

Try using a extension cord from a outlet on a different circuit and see if that helps. I ended up running a dedicated circuit for my Classe amp and the problem was solved.

Good luck,
Gary
 
spinaker01
491 posts
 
I think there’s a ground switch on the back panel, try that
esthlos13 OP
90 posts
 
So tried a bunch of different tests and the cyclical buzz hum seems to only manifest when I have the marantz 8802a on the input for the TiVo mini. Going to try one of the cable tv ground loop isolators and see if that gets rid of it.  
esthlos13 OP
90 posts
 
Oh and the ground switch on the back, after reading the manual is only for unbalanced inputs. I’m using balanced but thanks for the suggestion. 
esthlos13 OP
90 posts
 
Cable tv ground loop eliminator and emotiva cmx-2 have been ordered will post back in the next week or two when they have been tested. 
More to discover